Chemical fracturing fluid for hot dry rock

The invention relates to chemical fracturing fluid for hot dry rock, which is prepared by mixing fluoboric acid, polyamino polyether methylene phosphonate and aluminum chloride hexahydrate. After the prepared chemical fracturing fluid is injected into a thermal reservoir of the hot dry rock, fluoboric acid is hydrolyzed to generate HF (hydrogen fluoride) gradually, the reaction speed with a stratum is lower, and deep penetration can be achieved. Polyamino polyether methylene phosphonate as polyatomic acid, can be decomposed into hydrogen ions at multiple stages, acts on the stratum for a long time, extends a penetration distance of chemical fracturing, further achieves a deep thermal reservoir transformation effect and has performance such as low speed, low damages, scale prevention and corrosion inhibition; simultaneously, phosphonate of polyamino polyether methylene phosphonate has significant absorption and water-dampness characteristics which can catalyze reaction between hydrofluoric acid and quartz and allow the corrosion speed of the quartz to be increased with time; and the improvement on the radial deep penetrability of the reservoir is facilitated.